// FunctionCallNode.cs
//
// Copyright (c) 2008 Jérémie "Garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//

using System;
using System.Reflection;
using System.Collections.Generic;

using Irony.Compiler;
using Irony.Compiler.AST;

using Microsoft;
using Microsoft.Linq;
using Microsoft.Linq.Expressions;

namespace Bechamel
{
	public class FunctionCallNode : BechamelNode
	{
		IdentifierNode id;
		AstNodeList funArgs;
		
		public FunctionCallNode(NodeArgs args, IdentifierNode id, AstNodeList funArgs)
			: base(args)
		{
			this.id = id;
			this.funArgs = funArgs;
		}
		
		public override Expression GenerateExpression(ETGenerator generator)
		{
			List<Expression> parameters = new List<Expression>();
			
			foreach (AstNode node in funArgs) {
				BechamelNode p = node as BechamelNode;
				
				if (p == null)
					throw new InvalidOperationException("An AST node that is not a BechamelNode has been found");

				Expression convertedParam = 
					Expression.TypeAs(p.GenerateExpression(generator), typeof(Object));
				parameters.Add(convertedParam);
			}
			
			
			MethodInfo m = FunctionLookupTable.GetMethodInfo(id);
			// Standard function
			if (m != null) {
				return Expression.Call(null, m, parameters);
			}
			
			// Try to get the function from the defines
			Expression func = generator.GetDefine(id.Name);
			func = Expression.TypeAs(func, typeof(Function));
						
			Expression ps = Expression.NewArrayInit(typeof(Object),
			                                        parameters.ToArray());
			return Expression.Call(func, Function.CallInfo,
			                       ps);
		}
	}
}
